منابع مشابه
Compression detection, Image quality, JPEG
The paper presents two methods of prior JPEG-compression detection. In the first method the histogram of chrominance is analysed. In JPEGcompressed images the histogram contains significantly more local maxima than in uncompressed files. The second method is based on neighbouring pixel Ø value difference. In JPEG-compressed image the distribution of these values is different than the distributi...
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Digital image compression algorithms have become increasingly popular due to the need to achieve coste ective solutions in transmitting and storing images. In order to meet various transmission and storage requirements, the compression algorithm should allow a range of compression ratios, thus providing images of di erent visual quality. This paper presents a modi ed JPEG algorithm that provide...
متن کاملThe Jpeg Image Compression Algorithm
The basis for the JPEG algorithm is the Discrete Cosine Transform (DCT) which extracts spatial frequency information from the spatial amplitude samples. These frequency components are then quantized to eliminate the visual data from the image that is least perceptually apparent, thereby reducing the amount of information that must be stored. The redundant properties of the quantized frequency s...
متن کاملColor Space Selection for JPEG Image Compression
The Joint Photographic Experts Group's image compression algorithm has been shown to be a very efficient and powerful method of compressing images. However, there is litde substantive information about which color space should be utilized when implementing the JPEG algorithm. Currendy, the JPEG algorithm is set up for use with any three component color space. The objective of this research was ...
متن کاملImage Compression : The Mathematics of JPEG 2000
We briefly review the mathematics in the coding engine of JPEG 2000, a state-of-the-art image compression system. We focus in depth on the transform, entropy coding and bitstream assembler modules. Our goal is to present a general overview of the mathematics underlying a state of the art scalable image compression technology.
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ژورنال
عنوان ژورنال: Advances in Science and Technology Research Journal
سال: 2018
ISSN: 2080-4075,2299-8624
DOI: 10.12913/22998624/87041